実じっ姉し

noun

biological older sister; real elder sister

Used to specify a blood-related older sister, as opposed to a sister-in-law (義姉) or stepsister. Common in formal writing, family registers, and when clarifying relationships.

• 彼かの女じょは私わたしの実じっ姉しで、三みっつ年とし上うえです。

  She is my biological older sister, three years older than me.

• 戸こ籍せきには実じっ姉しとして記き載さいされている。

  She is listed as a biological older sister in the family register.